[petsc-dev] Unions of IS and MatNest

[Pierre Jolivet]

Thanks!

> On 24 Mar 2020, at 4:50 PM, Lawrence Mitchell <wence at gmx.li> wrote:
> 
> 
> 
>> On 24 Mar 2020, at 15:39, Pierre Jolivet <pierre.jolivet at enseeiht.fr> wrote:
>> 
>> Hello Lawrence,
>> Any luck finding the appropriate patch?
> 
> It's pretty old

I can see that, any reason why you didn’t try to get this into master?
Do you think it’s best for the caller to do this?

Thanks,
Pierre

> and doesn't apply cleanly, but see attached.
> 
> We use a similar idea (working) in Firedrake (see https://github.com/firedrakeproject/firedrake/blob/master/firedrake/matrix_free/operators.py#L16)
> 
> That latter algorithm has had more testing.
> 
> Thanks,
> 
> Lawrence<0001-WIP-Support-pulling-arbitrary-subblocks-out-of-MATNE.patch>